Electric bell.



E. A. GRAHAM.

' ELECTRIC BELL.

APPLICATION FILED FEB.

3 SHEETS-SHEET l.

Patented Oct. 19, 1909.

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FZ/WW ME V E. A. GRAHAM.

ELECTRIC BELL.

APPLICATION rum) FEB. 2, 1909.

Patented 001). 19, 1909.

s SHEETS-SHEET 2.

5 Luv/MM I E. A. GRAHAM.

ELECTRIC BELL.

APPLICATION FILED FEB 2, 1909.

937,594. Patented 0pt.19,1909.

3 SHEETS-SHEET 3 UNITED srnrns ELECTRIC BELL.

Specification of Letters Patent. 7

()FFIGE.

tile Oct. 19, 1909.

raten Application filed-February 2, i909. Serial No. 475,589.-

To all rah/om it may concern:

. Be it known that I, Ebwnnn ALFRED Gin"- HAM, a subject of the King ofGreat Britain and Ireland, residing at Brockley, in the g openings inthe top and bottom of the casing so that the latter is at these partswater-" county of London, England, have invented Improvements in orRelating to Electric:

Bells, of which the following is a specification.

- This invention relates to electric bells of the kind in which thestrikingmechanism comprises a striker constituted as a movable magneticelement adapted tobedirectly influenced by the electro-magneticy elementin such manner that the striking of the bell is effected by momentum ofthe magnetic element'acquired upon excitation .of the electro-magneticelements and damping of the bell vibrations or rebound of the striker isprevented by the combined action on the striker ofgravityand'that of theelectro-magnetic device aided or not by asprin'.

g Y The object of the present invention isto generally improve theconstruction .of such a pletely protected against moisture and so thatthe parts which are exposed shall be unj enamel, or'; be otherwisetreated so that alfected thereby.

In the accompanying drawings, Figurel arts removed, Fig. 2 a'centralvertical sectlon on the line A of Fig. 1, and Fig. 3 an underside view,

is a front elevation with A of a sin 10 stroke bell. Figs. 4 and 5 arefront e ovations, showin modifications. Fig. 6 is a detail view,p..rt'ly in section,

showing a further modification; Fig. 7 is a cross section of a modifiedfdrm of striker.

AS shown in Figs. 1, 2 and 3, a skeleton frame a is employed having arim the upper portion 12 of which is appnoximately semic lindric'al andof an interfial'r'adius greater than the radius correspondihg to theexternal diameter of the gong :0 so that the. said gon is partiallysurrounded thereby, while the ower'portion 6 of the rim, also of approximately semicylindrical form, is of lesser Width than the portionZ9" but -"corresp onds .substantially in dimensions to the edge of thegong c. The frame a may he supported in any convenient way,'lugs (,1being shown on the rim portions 1), b for this purpose.

The gong c is carried by acasing esecu ed, as by screws'e 'to thefra'ame a, the attachment of the gong c to the casings being efiected bya screvv c 'enteringjalug orprojection e on the casing. The casing eserves bell so that the electrical parts arecn'uefl Ito messes solenoidf which may convenin turn sweated into correspondingly shaped i tight.The casing (2 also constitutes a terminal chamber c that is fitted-twitha Watertight cover 6' andv a watertight gland e to which for example alead, sheathed cable 2' i passing therethrough can be soldered. Theterminal chamber c contains a block 7' of insulating material to whichare secured two metal terminal blocks is, k the ends of the solenoidwinding 7 being attached thereto by the two conductors n n of the cable2' similarly attached by the screws n a The solenoid is provided' with acombined solenoid'co1'eand'gong. Striker 0 that may advantageoiisly.be'madehollow with a rounded head-0 andjlie sheathed, asbyele'ctro-deposiheri cactiom sfuchIfor-exanlple as copper; or,alternativelyg'be coated with an appropriate composition, such .forexample as vitrified there shall be no liability of the core sticking inthe tube 9 by reason of rust or other deposit. .To act as a support forthe core enoid f when the latter is denergized, a flanged tube 7) ofcopper or similar metal proper-operative position relative to the sothecurrent.

the screws m m respectively and .the ends ofdize or becomeadverselyali'ected by atmos.

the continuance of the flow of cur-j;

iently be ivoundfiipon a tube 9 'the ends WhlCh are sweated into cheeksit themselves- ="tion, with afipnetal that will not readily (ax-istriker ,0.,-.and maintain the same in the v may be attached by screws pto the lower che'elr h, the said tube having a perforated d relativelyto. and the proportionatele'ngth 0f.

oid iritheturniug the core to interme diate position and finallyret'urnmgthe core to the initial position uponinterruptiomof Asamodificatioin'the core 0 instead or d-istance by forming the core 0 withlon itu-- hollow electro-niagnctic winding having its ing the strikerpartly within "and partly I ceases casing surrounding said winding,cheeks into which the tube is sweated andthemselves sweated into thesaid casing, a magnetizable striker vertically movable through the saidtube and a perforated tube alined with'the latter tube in which thestriker is normally supported. 7

'5. An electric bell, comprising a gong, a solenoid having its axisvertically arran 'ed, a tube extending through said solenoi a casingsurrounding said Windin ,cheeks-into which the tube 1s sweated anthemselves sweated into the said casing, a tennmal chamber forming partof said casing, a

rectly striking the (gong 0, may, as shown in Fig. 4:, be arrange to actagainst a striker head 0 which is arran ed to slide within a bearing 0and is maintained normally out .5 of contact with the gong and seatedupon its bearing 0 by a spring 0 the. arrangement being such that whenthe core 0, after having acquired momentum, forces the head,

' against the influence of the spring 0 into 10 contact with the gong,the spring assists the combined action of gravity and the solenoid inproducing return movement of the striker. As will be obvious, in lieu ofarranging the parts Within the gong as illustrated, the

15 gong might be located to be struck exteriorly, as shown in Fig. 5,Where the luge for the gong c is formed'upon the frame a and the latterextended as at a to support the casing 6. Also, in either of sucharrangements, any

as ordinary contact maker and breaker or cir cuit interrupter might beemployed to convert the bell from a single stroke into a vi- I bratingbell, the same being either inclosed,

as shownat r in Fig. 6 in the Water tight casing e, or in aseparatecasing as diagrammatlcally indicated at s m'F 1g. 1. As willalso be obvious, the construction of the elements may be modifiedwithout departing from the scope of the invention, as for inwatertightgland through which" the leads to, the solenoio. pass into the chamber,a magnetizable striker vertically movable throughthe said tube and aperforated tube almed normally supported. I

6. An electric bell comprising a gong, a solenoid having its axisvertically arranged, a casing inclosing the solenoid in a waterchamber,a removable Waterti ht cover for said chamber, a watertight g andthrou'h which the leads to the solenoid pass into to e chamber, acircuit maker and breaker arranged in the circuit of said Windin astriker vertically movable through the-so e oid casing and a perforatedcarrier for su 4 porting the striker partly Within and part y withoutsaid casing. I

7. An electric bell, comprising a gong, a solenoid having itsaxisvertically'arranged, I a tube extending through said solenoi acasing s rrounding said windin cheeks into which (is tube is sweated anthemselves sweate into the said casing, a'connection: i951 boxi'giirming part ofjsaid casing-.waiwaterfl tight removable covertherefor,'a watertight, gland through which the leadsto. thesoleneid,pass into'the connection box, a'circu'it maker: and breaker andcontactterminalsin's'aidllfl box, a magnetizable striker ,vertically movf ablethrough the saidtubeand, ap'erfor'ated {tubealined with the latter tubeinwhich the striker is normally ,:supported. ,l 1

dinal grooves, as shown in Fig. 7, for light ening the weight thereof.hat-I claim is:--

1. An electric bell. comprising a gong, a

32115 vertically arranged, a water tight casing iuclosing the saidwinding cxteriorly and interiorly, a non-corrodible striker verticallymovable through the 'ivatertight cas- 40 ing and a perforated carrierfor supporting the striker partly within and partly Without the saidcasing.

2. An electric bell comprising a gong, a hollow electromagnetic windinghaving its axis vertically arranged, a watertight casing inclosing thesaid winding exteriorly and interiorly, a hollow non corrodible strikervertically movable through the v 'lttjtrt' 'htg, casing and a perforatedcarrier for sup t without the said casing. v solenoid having its axisvertical arran ed, 3. An electric bell comprising agong, a a tubeextending thro lgh said solenoi a solenoid having its axis verticallyarranged, casing shrro'unding said winding, cheeks into a casinginclosing the solenoid in a waterwhich the ,tube is secured in aWatertight, 55 tight manner and. constituting a. terminal manner andthemselves secured in'a water chamber, a removable, Watertight cover fortight manner to the said casing a terminal said chamber, a Water tightgland through chamber forming part of san ,casing, a' which the leads tothe solenoid, pass into Watertight removable cover therefor, 11 thechamber, a striker vertically movable Watertight glandthrough which theleads to watertight removable cover therefor, a so tight manner andconstituting a terminal 90 8. An electric bell comprisinga gong, a 11560 through the solenoid casing anda perforated the solenoid pass intothe chamber, a-mag,,';2" 3

carrier for supporting the striker partly netizable striker verticallymovable throng W within and partly Without said casing. the said tube, aperforated tube alined with An electric bell, comprising a gong, a thelatter tube and in which the striker issolenoid having; itsaxisvertically arranged, normally supported, a frame, carrying the" tubeextending through said. solenoid, a l

casing of the solenoid and a lug on the casoregomg parts and is struckby the striker onits inner periphery. v

9. An electric bell,comprising a gong, a solenoid having its axisvertically arran ed, a tube extending through said 'solenoi a casingconnected to said tube and inolosing said winding in a watertightmanner, a connection box forming part of said casing, a water tightremovable cover therefor, 21 watertight gland through which the leads tothe solenoid pass into the, connection box, a circuit maker and breakerand contact terminals in suid'box, a nmgnetizable striker verticallymovable through said tube, a perforated tube ,alined with the lattertube, in

which the strike; is normally supported, a

frame carryingi1 t}? casing of the solenoid and 9. lug on t e" usingcarrying the gong so that it conceals the whole of the foregoing partsend is struck by the striker on its inner-periphery.

Signed at St. Andrews Works Cr'ofton Pork -Br0ck1ey, London, thisfifteenth day ofJanuai- 1909.

EDWARD ALFRED GRAHAM;

Witnesses: f

ELI ZARRARD,

' W. J. RICKETS.

